java - 将结果集转换为字符串数组

Question

我需要将我的结果集转换为字符串数组。我正在从数据库中读取电子邮件地址，我需要能够像这样发送它们:

message.addRecipient(Message.RecipientType.CC, "abc@abc.com,abc@def.com,ghi@abc.com");

这是我读取电子邮件地址的代码:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Test {

    public static void main(String[] args) {
        Connection conn = null;
        String iphost = "localhost";
        String dbsid = "ASKDB";
        String username = "ASKUL";
        String password = "askul";

        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            String sql = "SELECT * FROM EMAIL";
            conn = DriverManager.getConnection("jdbc:oracle:thin:@" + iphost + ":1521:" + dbsid, username, password);
            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery(sql);
            String[] arr = null;
            while (rs.next()) {
                String em = rs.getString("EM_ID");
               arr = em.split("\n");
               for (int i =0; i < arr.length; i++){
                   System.out.println(arr[i]);
               }
            }
        } catch (Exception asd) {
            System.out.println(asd);
        }
    }
}

我的输出是:

myemailaddress@abc.com
myotheremail@abc.com

我需要这样的:

myemailaddress@abc.com,myotheremail@abc.com

我正在使用 Oracle 11g。

Answer 1

得到想要的输出:

替换这些行

String[] arr = null;
while (rs.next()) {
    String em = rs.getString("EM_ID");
    arr = em.split("\n");
    for (int i =0; i < arr.length; i++){
        System.out.println(arr[i]);
    }
}

由

String arr = null;
while (rs.next()) {
    String em = rs.getString("EM_ID");
    arr = em.replace("\n", ",");
    System.out.println(arr);
}